diff --git a/models/repo/repo_manifest.go b/models/repo/repo_manifest.go
index 989342530c..0934b33ff1 100644
--- a/models/repo/repo_manifest.go
+++ b/models/repo/repo_manifest.go
@@ -5,6 +5,7 @@ package repo
 
 import (
 	"context"
+	"strings"
 
 	"code.mokoconsulting.tech/MokoConsulting/MokoGitea/models/db"
 	"code.mokoconsulting.tech/MokoConsulting/MokoGitea/modules/timeutil"
@@ -60,25 +61,42 @@ func (RepoManifest) TableName() string {
 }
 
 // joomlaTypePrefix maps Joomla extension types to their element name prefixes.
+// Derived from Joomla 6 source: libraries/src/Installer/Adapter/*Adapter.php
+// Plugins use bare names (no prefix) — Joomla stores them as just the element name.
 var joomlaTypePrefix = map[string]string{
 	"component": "com_",
 	"module":    "mod_",
-	"plugin":    "plg_",
 	"package":   "pkg_",
 	"template":  "tpl_",
 	"library":   "lib_",
 	"file":      "file_",
 }
 
-// AutoElementName returns the auto-constructed Joomla element name (e.g. pkg_mokowaas).
+// cleanJoomlaElement replicates Joomla's InputFilter::clean($value, 'cmd')
+// which lowercases and strips all characters except [a-z0-9._-].
+func cleanJoomlaElement(name string) string {
+	lower := strings.ToLower(name)
+	var b strings.Builder
+	b.Grow(len(lower))
+	for _, r := range lower {
+		if (r >= 'a' && r <= 'z') || (r >= '0' && r <= '9') || r == '.' || r == '_' || r == '-' {
+			b.WriteRune(r)
+		}
+	}
+	return b.String()
+}
+
+// AutoElementName returns the auto-constructed Joomla element name (e.g. pkg_mokosuitebackup).
+// The name is lowercased and cleaned to match Joomla's InputFilter::clean('cmd') behavior.
 func (m *RepoManifest) AutoElementName() string {
 	if m.Name == "" || m.PackageType == "" {
 		return ""
 	}
+	cleaned := cleanJoomlaElement(m.Name)
 	if prefix, ok := joomlaTypePrefix[m.PackageType]; ok {
-		return prefix + m.Name
+		return prefix + cleaned
 	}
-	return m.Name
+	return cleaned
 }
 
 // FullElementName returns the effective element name: override if set, otherwise auto-constructed.